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Melinda L. Telli, William J. Gradishar and John H. Ward

Advances in molecular testing have ushered in the new era of precision medicine. The 2018 publication of the TAILORx trial helped refine the use of genetic expression assays, specifically the 21-gene recurrence score, in assigning patients to endocrine therapy alone or with chemotherapy. The NCCN Guidelines for Breast Cancer explore the clinical applications of this study. The algorithm for managing the axilla in early breast cancer has been further refined, based on the presence or absence of clinical evidence of lymph node involvement. Ovarian suppression has been validated as the optimal approach in higher risk premenopausal women, based on updated analysis of the SOFT and TEXT pivotal trials. In the metastatic setting, the NCCN Guidelines further reinforce the benefit of the CDK4/6 inhibitors, extending the “preferred” recommendation to all the available agents in metastatic disease. Options in triple-negative breast cancer now include, for the first time, an immunotherapeutic agent.

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Neil P. Shah

The NCCN Guidelines for Chronic Myeloid Leukemia (CML) criteria for discontinuation of tyrosine kinase inhibitor (TKI) therapy have not seen significant updates in the past year, but the current guidelines reinforce the safety of treatment discontinuation in appropriate and consenting patients with CML in the chronic phase who have achieved and maintained a deep molecular response. According to Dr. Neil Shah, who presented the current data, some clinicians are still unaware that treatment discontinuation is an option. Patients who wish to stop TKI therapy should consult with a CML specialty center to confirm that discontinuation is safe and appropriate; they also should be counseled on all potential benefits and risks of stopping therapy, including TKI withdrawal syndrome. In patients with CML who experience relapse after discontinuing TKI therapy, a second TKI discontinuation can be successful among those who regained a deep molecular response after TKI rechallenge, although experience to date with second discontinuation attempts is very limited. Second-generation TKIs have also demonstrated improvement in rates of deep molecular remission, making treatment discontinuation possible for a larger proportion of patients.

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Wells A. Messersmith

In the last year, several impactful updates have been added to the NCCN Guidelines for Colorectal Cancer (CRC) for the management of metastatic disease, including additional options for BRAF-mutated advanced CRC and the inclusion of combination immunotherapy (PD-1 and CTLA-4) for deficient mismatch repair/microsatellite instability (MSI)–high advanced CRC. According to Dr. Wells A. Messersmith, targeted therapies (ie, VEGFR, EGFR, multitargeted tyrosine kinase inhibitors) play an important role in CRC management, but none of them have been successful in the adjuvant setting (although checkpoint inhibition is now being tested in MSI-high stage III CRC). Reliable predictive biomarkers for most agents are still greatly lacking, highlighting the importance of investing in CRC biomarker studies.

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Eric Jonasch

The NCCN Guidelines for Kidney Cancer have undergone a major shift in the risk categorization used for designating “preferred” and “other recommended” or “useful under certain circumstances” first-line treatments. In the most recent version of the guidelines, “favorable risk” is now its own risk category and “intermediate risk” and “poor risk” are combined into one category. The treatment recommendations for clear cell renal cell carcinoma are continually revised and more new options are anticipated based on encouraging results from pivotal trials. In his presentation at the NCCN 2019 Annual Conference, Dr. Jonasch described these promising findings.

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Thomas W. Flaig

The treatment landscape of bladder cancer has changed rapidly over the past several years. The 2019 version of the NCCN Guidelines has integrated changes to tumor staging that reflect an updated understanding of the natural history of the disease and will affect how patients are treated. Further, 5 PD-1/PD-L1 immune checkpoint inhibitors (ICIs) are approved for the treatment of bladder cancer. The FDA has limited use of ICIs as monotherapy in the first-line treatment of metastatic and advanced disease for patients who are platinum-ineligible or are cisplatin-ineligible with high PD-L1 expression and are candidates for ICIs. Ongoing predictive biomarker development and validation are needed in bladder cancer; the development of better biomarkers will be key in patient selections for therapy going forward.

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James L. Mohler and Emmanuel S. Antonarakis

Updates to the NCCN Guidelines for Prostate Cancer include further refinements in taking a family history, new recommendations for germline and somatic testing, use of androgen receptor blockers for nonmetastatic castration-resistant prostate cancer, advice regarding intermittent versus continuous androgen deprivation therapy, and consideration of whether to treat the primary tumor in men diagnosed with de novo metastatic prostate cancer.

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Matthew A. Gubens and Marianne Davies

For the use of immunotherapy in metastatic non–small cell lung cancer (NSCLC), the NCCN Guidelines for NSCLC reflect the importance of assessing levels of PD-L1 expression to determine the best use of PD-1/PD-L1 inhibitors, whether alone or in combination with chemotherapy. Patients who lack a driver mutation and have tumor PD-L1 expression ≥50% are recommended to receive single-agent pembrolizumab, although combining with carboplatin/pemetrexed is also a reasonable choice, especially if there is higher burden of disease. For tumors with PD-L1 expression <50%, it is important to distinguish between nonsquamous and squamous cell carcinoma (SCC). For patients with non-SCC disease, pembrolizumab + carboplatin/pemetrexed is preferred. Alternately, a 4-drug regimen of carboplatin/paclitaxel/bevacizumab/atezolizumab is reasonable, especially for patients ineligible for pemetrexed. In patients with SCC, carboplatin + paclitaxel or nab-paclitaxel with pembrolizumab is a category 1 recommendation. Tumor mutational burden is emerging as a biomarker for efficacy but is not yet ready to be used in patient selection. Optimal management of the unique toxicities associated with immunotherapy, which can be more frequent with these combinations, is also critical for good outcomes.

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Margaret A. Tempero

Outcomes for pancreatic cancer are becoming less discouraging with the refinement of molecular profiling, both germline and somatic, and beneficial effects seen with adjuvant chemotherapy. The NCCN Guidelines for Pancreatic Adenocarcinoma reflect these advances, and recommend that clinicians consider germline testing for all patients with pancreatic cancer and consider a molecular analysis for those with metastatic disease. The guidelines further recommend that clinicians consider adjuvant therapy with modified FOLFIRINOX (leucovorin/5-FU/irinotecan/oxaliplatin) for patients who are able to tolerate it.

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Gary H. Lyman

Biosimilars are here to stay, but whether they will enjoy widespread uptake remains to be seen. The FDA sets a high bar for approval of biosimilar products, yet many clinicians remain skeptical about the efficacy and safety of these agents. Favorable experience with >30 biosimilars in Europe provides some reassurance that these agents are safe and effective and can be substituted for the reference product.